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UV Digital Micromirror Spectrometer for Dispersive AFS: Spectral Interference in Simultaneous Determination of Se and Pb

Abstract

Hollow cathode lamps (HCLs) are a type of excitation light sources most commonly used in hydride generation atomic fluorescence spectrometry (HG–AFS). It has been found that there is obvious Pb spectral interference in the spectrum of Se HCL, which will induce higher measured results than real value, specially using the non-dispersive detection method, when Se and Pb are detected simultaneously. To solve the spectral interference caused by HCLs, in this paper, a UV digital micromirror spectrometer using a digital micromirror device (DMD) as a spatial light modulator, a grating as a spectroscope, and a photomultiplier tube (PMT) as a detector, was specially designed for dispersive atomic fluorescence spectrometry. In addition, a modified DMD with a cover window made of Corning HPFS® 7980 standard grade fused silica was used to provide a higher transmittance of 180–320 nm. The most attractive feature of this UV digital micromirror spectrometer is its simple structured, high sensitivity, no macro moving parts, and speedy spectral analysis (0.419s per spectrum scan). After optimizing the control parameters of DMD and PMT, the characteristics of the effects of the chemical generation system (K3Fe(CN)6, KBH4, Hydrochloric Acid) were investigated. The atomic fluorescence spectra of Se and Pb were obtained, and the detection limits of the analytical lines were discussed. The feasibility of the present method was confirmed by the simultaneous detection of Se and Pb with water samples (GSBZ50031-94 and GSB07-1183-2000) and multi-element standard solution (GBW(E)080669) as reference materials. This paper demonstrates the potential of the UV digital micromirror spectrometer for dispersive HG-AFS. The purity requirements of the light source can be reduced appropriately, and the spectral interference of light sources could be solved effectively. In addition, it is also applicable to simultaneous detection using multi-element HCLs or continuous light sources.

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Publication details

The article was received on 11 Jul 2018, accepted on 28 Sep 2018 and first published on 29 Sep 2018


Article type: Paper
DOI: 10.1039/C8JA00230D
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    UV Digital Micromirror Spectrometer for Dispersive AFS: Spectral Interference in Simultaneous Determination of Se and Pb

    C. Tao, C. Li, Y. Li, H. Wang, Y. Zhang, Z. Zhou, X. Mao, Z. Ma and D. Tian, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00230D

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